Chemical Reaction Engineering
At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenious law is used. What will be this ratio, if transition state theory is used with the same value of E/R?

2.24
2.5
2
1.6

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Chemical Reaction Engineering
The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m³ is fed to the reactor at the rate of 0.01 m³ /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k)is (Data: Heat of reaction at 298 K = - 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature))

500
400
1000
600

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Chemical Reaction Engineering
In a zero order reaction, reactants concentration does not change with time and the

Reaction rate is trebled when the initial concentration is trebled
Time for half change is independent of the initial concentration
Time for completion of the reaction is independent of the initial concentration
Time for half change is half the time taken for completion of the reaction

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